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<meta name="description" content="独立的 LED 小灯可以实现流水灯，数码管可以显示多位数字，那点阵 LED 就得来显示一点花样了。 我们要显示花样的时候，往往要先做出来一些小图形，这些小图形的数据要转换到我们的程序当中去，这个时候就需要取模软件。给大家介绍一款简单的取模软件，这种取模软件在网上都可以下载到，大家来了解一下如何使用，先看一下操作界面，如图 7-3 所示。  图 7-3  字模提取软件界面  鼠标点一下“新建图形”，">
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<meta property="og:description" content="独立的 LED 小灯可以实现流水灯，数码管可以显示多位数字，那点阵 LED 就得来显示一点花样了。 我们要显示花样的时候，往往要先做出来一些小图形，这些小图形的数据要转换到我们的程序当中去，这个时候就需要取模软件。给大家介绍一款简单的取模软件，这种取模软件在网上都可以下载到，大家来了解一下如何使用，先看一下操作界面，如图 7-3 所示。  图 7-3  字模提取软件界面  鼠标点一下“新建图形”，">
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          <h1 class="post-title" itemprop="name headline">7.4、LED点阵的图形显示</h1>
        

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        <p>独立的 LED 小灯可以实现流水灯，数码管可以显示多位数字，那点阵 LED 就得来显示一点花样了。</p>
<p>我们要显示花样的时候，往往要先做出来一些小图形，这些小图形的数据要转换到我们的程序当中去，这个时候就需要取模软件。给大家介绍一款简单的取模软件，这种取模软件在网上都可以下载到，大家来了解一下如何使用，先看一下操作界面，如图 7-3 所示。</p>
<p><img src="http://c.biancheng.net/cpp/uploads/allimg/140317/1-14031F10529226.png" alt></p>
<center><strong>图 7-3  字模提取软件界面</strong></center>

<p>鼠标点一下“新建图形”，根据我们板子上的点阵，把宽度和高度分别改成 8，然后点确定，如图 7-4 所示。</p>
<p><img src="http://c.biancheng.net/cpp/uploads/allimg/140317/1-14031F10G9127.png" alt></p>
<center><strong>图7-4  新建图形</strong></center>

<p>点击左侧的“模拟动画”菜单，再点击“放大格点”选项，一直放大到最大，那我们就可以在我们的 8*8 的点阵图形中用鼠标填充黑点，就可以画图形了，如图 7-5 所示。<br><img src="http://c.biancheng.net/cpp/uploads/allimg/140317/1-14031F10U1911.png" alt></p>
<center><strong>图7-5  字模提取软件画图</strong></center>

<p>经过我们的一番精心设计，画出来一个心形图形，并且填充满，最终出现我们想要的效果图，如图 7-6 所示。</p>
<p><img src="http://c.biancheng.net/cpp/uploads/allimg/140317/1-14031F1101BN.png" alt></p>
<center><strong>图 7-6  心型图形</strong></center>

<p>由于取模软件是把黑色取为 1，白色取为 0，但我们点阵是 1 对应 LED 熄灭，0 对应 LED点亮，而我们需要的是一颗点亮的“心”，所以我们要选“修改图像”菜单里的“黑白反显图像”这个选项，再点击“基本操作”菜单里边的“保存图像”可以把我们设计好的图片进行保存，如图 7-7 所示。</p>
<p><img src="http://c.biancheng.net/cpp/uploads/allimg/140317/1-14031F11122458.png" alt></p>
<center><strong>图 7-7  保存图形</strong></center>

<p>保存文件只是为了再次使用或修改使方便方便，当然你也可以不保存。操作完了这一步后，点击“参数设置”菜单里的“其他选项”，如图 7-8 所示。</p>
<p><img src="http://c.biancheng.net/cpp/uploads/allimg/140317/1-14031F1122O35.png" alt></p>
<center><strong>图 7-8  选项设置</strong></center>

<p>这里的选项，要结合图 7-2 来进行设置，大家可以看到 P0 口控制的是一行，所以用“横向取模”，如果控制的是一列，就要选“纵向取模”。选中“字节倒序”这个选项，是因为图7-2 中左边是低位 DB0，右边是高位 DB7，所以是字节倒序，其它两个选项大家自己了解，点确定后，选择“取模方式”这个菜单，点一下“C51 格式”后，在“点阵生成区”自动产生了 8 个字节的数据，这 8 个字节的数据就是取出来的“模”，如图 7-9 所示。</p>
<p><img src="http://c.biancheng.net/cpp/uploads/allimg/140317/1-14031F11354G9.png" alt></p>
<center><strong>图 7-9  取模结果</strong></center>

<p>大家注意，虽然我们用了软件来取模，但是也得知道其原理是什么，在这个图片里，黑色的一个格子表示一位二进制的 1，白色的一个格子表示一位二进制的 0。第一个字节是 0xFF，其实就是这个 8*8 图形的第一行，全黑就是 0xFF；第二个字节是 0x99，低位在左边，高位在右边，大家注意看，黑色的表示 1，白色的表示 0，就组成了 0x99 这个数值。同理其它的数据大家也就知道怎么来的了。</p>
<p>那么下面我们就用程序把这些数据依次送到点阵上去，看看运行效果如何。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line">#include &lt;reg52.h&gt;</span><br><span class="line">sbit ADDR0 = P1^0;</span><br><span class="line">sbit ADDR1 = P1^1;</span><br><span class="line">sbit ADDR2 = P1^2;</span><br><span class="line">sbit ADDR3 = P1^3;</span><br><span class="line">sbit ENLED = P1^4;</span><br><span class="line">unsigned char code image[] = &#123; //图片的字模表</span><br><span class="line">    0xFF, 0x99, 0x00, 0x00, 0x00, 0x81, 0xC3, 0xE7</span><br><span class="line">&#125;;</span><br><span class="line">void main()&#123;</span><br><span class="line">    EA = 1;  //使能总中断</span><br><span class="line">    ENLED = 0;  //使能 U4，选择 LED 点阵</span><br><span class="line">    ADDR3 = 0;</span><br><span class="line">    TMOD = 0x01;  //设置 T0 为模式 1</span><br><span class="line">    TH0 = 0xFC;  //为 T0 赋初值 0xFC67，定时 1ms</span><br><span class="line">    TL0 = 0x67;</span><br><span class="line">    ET0 = 1;  //使能 T0 中断</span><br><span class="line">    TR0 = 1;//启动 T0</span><br><span class="line">    while (1);</span><br><span class="line">&#125;</span><br><span class="line">/* 定时器 0 中断服务函数 */</span><br><span class="line">void InterruptTimer0() interrupt 1&#123;</span><br><span class="line">    static unsigned char i = 0;  //动态扫描的索引</span><br><span class="line">   </span><br><span class="line">    TH0 = 0xFC; //重新加载初值</span><br><span class="line">    TL0 = 0x67;</span><br><span class="line">    //以下代码完成 LED 点阵动态扫描刷新</span><br><span class="line">    P0 = 0xFF;  //显示消隐</span><br><span class="line">    switch (i)&#123;</span><br><span class="line">        case 0: ADDR2=0; ADDR1=0; ADDR0=0; i++; P0=image[0]; break;</span><br><span class="line">        case 1: ADDR2=0; ADDR1=0; ADDR0=1; i++; P0=image[1]; break;</span><br><span class="line">        case 2: ADDR2=0; ADDR1=1; ADDR0=0; i++; P0=image[2]; break;</span><br><span class="line">        case 3: ADDR2=0; ADDR1=1; ADDR0=1; i++; P0=image[3]; break;</span><br><span class="line">        case 4: ADDR2=1; ADDR1=0; ADDR0=0; i++; P0=image[4]; break;</span><br><span class="line">        case 5: ADDR2=1; ADDR1=0; ADDR0=1; i++; P0=image[5]; break;</span><br><span class="line">        case 6: ADDR2=1; ADDR1=1; ADDR0=0; i++; P0=image[6]; break;</span><br><span class="line">        case 7: ADDR2=1; ADDR1=1; ADDR0=1; i=0; P0=image[7]; break;</span><br><span class="line">        default: break;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>对于 8<em>8 的点阵来说，我们可以显示一些简单的图形，字符等。但大部分汉字通常来说要用到 16</em>16 个点，而 8*8 的点阵只能显示一些简单笔画的汉字，大家可以自己取模做出来试试看。使用大屏显示汉字的方法和小屏的方法是类似的，所需要做的只是按照相同的原理来扩展行数和列数而已。</p>

      
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